/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://plantuml.com/paypal
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 *
 *
 */
package net.sourceforge.plantuml.code;

public class Spiral {

	private PairInt current = new PairInt(0, 0);
	private PairInt direction = new PairInt(1, 0);
	private int step = 0;
	private int lim = 1;
	private int len = 1;
	private int cpt = 0;

	public PairInt nextPoint() {
		final PairInt result = current;
		oneStep();
		return result;
	}

	private void oneStep() {
		this.current = this.current.plus(this.direction);
		step++;
		if (step == lim) {
			this.direction = this.direction.rotate();
			cpt++;
			if (cpt == 2) {
				cpt = 0;
				len++;
			}
			lim += len;
		}
	}

}
